By 07/02/2014 9 Comments

How To Make CheckBox a Required Field on WebForm using jQuery

CheckBox control

  • It is an control which is used to select the data or information by the user
  • By this control end-user can check or select more than one data items or multiple data options at a time
  • Every control in renders an html mark up on browsers

Following is an example of checkbox in with the use of Jquery

jQuery Code snippet

<script type="text/javascript" src="Scripts/jquery-1.8.2.js"></script> <!-- call jquery file or library into page --->
        $(document).ready(function() { // this is a function which is called by browser when it loads a webpage

            $('[id$="TT_button"]').click(function (e) { // get button object, trigger it's click event and call anonymous function

                var totalchecked = $(':checkbox:checked').length; // get all checked checkboxs, count them by using length property, assign them into totalchecked variable 
                if (totalchecked == 0) // check, if no checkbox was checked
                    alert('Select Atleast One CheckBox'); // display alert
                    e.preventDefault(); // this function prevents the user to submit the form to server


                    alert('Postback occured'); // if, above if condition false executes else and display an alert




ASP.NET Code snippet

<!--- Following is the code which renders the checkBoxes and a button control on browser-->

<asp:Label runat="server" Text="Check Atleast One CheckBox before submitting the Form"></asp:Label>
        <br/> <br/>
        <asp:CheckBox ID="TT_Checkbox1" runat="server" Text=" 1st Option" /><br />
        <asp:CheckBox ID="TT_Checkbox2" runat="server" Text=" 2nd Option" /><br />
        <asp:CheckBox ID="TT_Checkbox3" runat="server" Text=" 3rd Option" />
        <br /><br />
        <asp:Button ID="TT_button" runat="server" Text="Submit"/>

Posted in: ASP.NET, jQuery

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